[docs] [issue12077] Harmonizing descriptor protocol documentation

[Franck Michea]

Changes by Franck Michea <franck.michea at gmail.com>:


Added file: http://bugs.python.org/file29041/12077_descriptor_howto_python2.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12077>
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